package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面类，实现公共字段自动填充处理逻辑
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    //定义切入点
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut() {}

    // 通知 使用前置通知  为公共字段赋值
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) {
        log.info("*****  Auto fill start  *****");
        // 获取当前操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature(); // 获取方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);// 获得方法上的注解
        OperationType operationType = autoFill.value();     // 获取数据库操作类型

        // 获取操作的实体对象
        Object[] args = joinPoint.getArgs();
        if(args == null || args.length == 0) {
            return;
        }
        Object entity = args[0];

        // 准备数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        // 反射，赋值
        if(operationType == OperationType.INSERT) {
            // 为4个公共字段赋值
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
            // 通过反射为对象赋值
                setCreateTime.invoke(entity,now);
                setCreateUser.invoke(entity,currentId);
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);

            } catch (Exception e) {
                e.printStackTrace();
            }

        }else if(operationType == OperationType.UPDATE) {
            // 为2个公共字段赋值
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                // 通过反射为对象赋值
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);

            } catch (Exception e) {
                e.printStackTrace();
            }
        }


    }


}
